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Dimitrios N. Konispoliatis and Spyridon A. Mavrakos
In the present study, the hydrodynamic efficiency of a cylindrical wave energy converter (WEC) of vertical symmetry axis and arranged in front of a reflecting orthogonal breakwater is explored. The idea is based on exploiting the anticipated amplificatio...
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Hadiseh Karimaei, Ramin Ghorbani, Seyed Mostafa Hosseinalipour
Pág. 179 - 188
Surface instability of a swirling liquid sheet emanating from a centrifugal injector in presence of external and internal gas flows is studied in this paper. A three-dimensional flow for the liquid sheet and two-dimensional flows for external and interna...
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De Zhi Ning, Xuan Lie Zhao, Li Fen Chen and Ming Zhao
The cost of wave energy converters (WECs) can be reduced significantly by integrating WECs into other marine facilities, especially in sea areas with a mild wave climate. To reduce the cost and increase the efficiency, a hybrid WEC system, comprising a l...
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Hideyuki Suzuki, Yuta Sakai, Yasuo Yoshimura, Hidetaka Houtani, Lucas H. S. Carmo, Haruki Yoshimoto, Ken Kamizawa and Rodolfo T. Gonçalves
A shallow draft cylindrical barge type floater with footing close to the water surface was experimentally evaluated in waves to investigate non-linear motion characteristics. The floater was designed to be used as an option for FOWT?floating offshore win...
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Maxim Durach
Electromagnetic fields in bulk bianisotropic media contain plane waves whose k-vectors can be found using the method of the index of refraction?s operator and belong to the Fresnel wave surfaces that fall into one of the five hyperbolic classes of the Du...
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Nina Efremova,Alexander Nilva,Nataliya Kotovskaya,Marina Dryha
Pág. 39 - 48
Vessels at shallow-water outer anchorage are exposed to a complex system of waves. This system results from the diffraction of sea-incident waves against a ship. When entering shallow waters, three-dimensional waves turn into two-dimensional ones. The wa...
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Josef Burian,Jaroslav Koton,Norbert Herencsar
Pág. 37 - 41
This paper deals about the design of a fast voltage-mode full-wave rectifier, where universal voltage conveyor and second-generation current conveyor are used as active elements. Thanks to the active elements, the input and output impedance of the non-li...
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Cheng-Tsung Chen, Jaw-Fang Lee, Hubert Chanson, Kuei-Ting Lin and Chun-Jih Lin
In this study, the problem of surface waves induced by water flow in a flow channel was investigated. The mathematical model based on the potential wave theory was established, and a new analytic solution to the corresponding initial and boundary value p...
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Dimitrios N. Konispoliatis
The present study explores the performance of an array of cylindrical oscillating water column (OWC) devices, having a vertical symmetry axis, placed in front of a bottom seated, surface piercing, vertical breakwater. The main goal of this study is the i...
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Mads Røge Eldrup and Thomas Lykke Andersen
Numerical tests are performed to investigate wave transformations of nonlinear nonbreaking regular waves with normal incidence to the shore in decreasing and increasing water depth. The wave height transformation (shoaling) of nonlinear waves can, just a...
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Marco Fontana, Pietro Casalone, Sergej Antonello Sirigu, Giuseppe Giorgi, Giovanni Bracco and Giuliana Mattiazzo
During the optimization phase of a wave energy converter (WEC), it is essential to be able to rely on a model that is both fast and accurate. In this regard, Computational Fluid Dynamic (CFD) with Reynolds Averaged Navier?Stokes (RANS) approach is not su...
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Mads Røge Eldrup and Thomas Lykke Andersen
Generation of high-quality waves is essential when making numerical or physically model tests. When using a wavemaker theory outside the validity area, spurious waves are generated. In order to investigate the validity of different wave generation method...
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Zhenlu Wang, Bingchen Liang and Guoxiang Wu
A series of physical experiments was conducted to study the geometry characteristics and evolution of sand waves under waves and currents. Large scale bedforms denoted as sand waves and small bedforms represented by ripples were both formed under the exp...
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Tahsin Tezdogan, Atilla Incecik, Osman Turan, Paula Kellett
Pág. 1659 - 1668
The slow steaming approach is increasing in popularity for commercial vessels, as it provides a method of reducing fuel use, and therefore operating costs, in the current economic climate. It is very important to be able to evaluate a ship's response to ...
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Bingbing Wan, Yuyun Shi and Zhifu Li
The interaction problem of waves with a body floating near the marginal ice zone is studied, where the marginal ice zone is modeled as an array of multiple uniformly sized floating ice sheets. The linear velocity potential theory is applied for fluid flo...
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Hossam S. Abdelwahab, Shan Wang, Josko Parunov and C. Guedes Soares
A new uncertainty quantifier is presented for linear transfer functions of wave-induced ship motions and loads obtained by various seakeeping codes. The numerical simulations are conducted for the high-speed Flokstra container ship in regular waves at va...
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Malek Abid, Christian Kharif, Hung-Chu Hsu and Yang-Yih Chen
The theory of surface wave generation, in viscous flows, is modified by replacing the linear-logarithmic shear velocity profile, in the air, with a model which links smoothly the linear and logarithmic layers through the buffer layer. This profile includ...
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Wei-Wei Ding, Wan-Zhen Yue, Song-Wei Sheng, Jing-Ping Wu and Zao-Jian Zou
The Bragg reflection of water waves by multiple vertical thin plates is investigated numerically and experimentally. The problem of surface gravity wave interaction with multiple vertical thin plates is formulated mathematically under the assumption of l...
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Hongyuan Shi, Xuri Zhang, Wenyan Du, Qingjie Li, Hengliang Qu and Zaijin You
The evolution of renewable energy technologies may surmount fossil fuel disadvantages. Wave energy is considered one of the best alternatives to fossil energy due to its advantages. The 40-year (1979?2018) spatio-temporal distribution of wave energy is p...
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Dimitrios N. Konispoliatis, Ioannis K. Chatjigeorgiou and Spyros A. Mavrakos
In this study, the problems of diffraction and radiation of water waves by a permeable vertical cylindrical body are formulated within the realm of the linear potential theory. The body, which is floating in constant water depth, is moored with a catenar...
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